Airplane signal



L. S. BARR.

AIRPLANE SIGNAL. APPLICATION FILED no, 1919.

Patented Dec. 16, 1919.

STATES PA orFioE.

. nnsrna s. am, or wnsnmqron, msrmcr or continue.

' Martens-sienna.

' Specification of Letters Patent.

. and more particularly to a warning signal plane descends to make alanding associated ,therewith. Usually when an airthe ilot shuts off theengine so that the flight o the or at right angles thereto;

airplane is noiseless, with the exception of,

the sound produced by the friction of the air on the wires andbody.Consequently,

it gives noWarning of its descent to .per-

sons who may be on the landing field. It is the principal object of thepresent 1n-' ing when an airplane is landing, and more particularly torovide a signal under the control of the pilot adapted to be actuated bythe wind roduced by the movement of the plane. novelty will be apparentfrom the description taken in connection with the drawings in which:

Figure 1 is a partial side elevation of an airplane provided with awarning signal inaccordance Withthe present invention;

Fig. 2 is a plan view mostly in section of a warning signal illustratingthe manner of' controlling the same and of securing it to the plane;

Fig- 3 is a front elevation of another form of the invention in whichthe signal is pivoted and controlled by swingin bring its mouth into thedirection-o flight Fig. 4 is a partial plan view of a plane furtherillustrating the manner of mounting shown in Fig. 3; and

ig. 5 is a sectional elevation through a fuselage of an ai 'laneillustrating another method of mounting the signal, eliminating the headresistance of the horn when not in use. I

Referring to the drawings the numeral 10- indicates an airplane having awarning signal ll associatedtherewith. As shown 1n Fig. 2 this signalmay be secured to one of the struts 12 of the lane by means of the clamp13. The si a shown in Fig. 2 is of the siren type.

ther objects and features of he flow of air the mouth 14 and through thesignal is con- Patented Dec. 16, 1919.

Application filed Kay 10, 1919. Serial No. 296,149.

. trolled by a valve such as indicated at 15.

This valve is adapted to be controlled by the pilot in any suitablemanner. As shown blades 19 of an air motor and thereby effects therotation thereof. The air discharged from these blades passes through aseries of apertures 20 formed in a rear wall of the warning signal. It ito be understood that other types of warning signals may be used, theinvention not beinglimited to the siren type. Obviously, the air motormight be associated with other forms of sig- 4 -nals so as to operatethe same. vention to provide a signal to give a warn- In Figs. 3 and 4the signal 11 is pivotally mounted on a support 21. For this purpose theslgnal has a boss 22 and a pivot pin 23 extends through the bracket intosaid boss.

Any suitable mechanism may be'provided for turning the signal on thepivot pin. As

shown the 'boss 22 has an arm 24; the freeend of which is connected to amember 25 extending to a point adjacentthe pilot. In the operation ofthis form of the invention the pilot actuates the member 25' so as toswing the signal to bring its mouth into the Wind caused by the flight,the flow of air provided. When the signal is disposed with- 1n thefuselage as indicated in full lines in Fig. 5 .it will not be'operatedand will not afford resistance to the air and will be flush withaperture in fuselage. When it is desired to sound the same, however, thearm 28 is moved downwardly, or string pulled or any other means ofoperating, thus projecting the horn through the aperture 27 so that airmay flow through and operate the same. w

Although the invention has been de-" scribed indetail itis to beunderstood that it is not limited to the forms shown but inthe air, andmeans to control the operation eludes modifications. and changes. whichof'the signal. come} within. the scope of the appended 2. Thecombination with an airplane, of I claims; v a warning signal associatedtherewith in- 15' 6 Having 'thus described the invention what eluding anair motor operated bythe wind I i claimed as new and desired to besecured produced by the movement of the'plane relby Letters Patent is: Yative to the air; and means to regulate the 1. The combination with anai lane, of flow of air through said motor, thereby con- Y a warningsignal associated t erew'ith trolling the operation of the signal. 20 10adapted to be operated 'by the wind pro-. In testimony whereof I-aflix msignature. duced by movementof the plane relative to Y LESTER BARR-

